Air condenser



Sept 30, 1930 F. H. KROGER AIR CONDENSER Filed May 2 1924 FRED H. KROGER @331 his @Mommg extending equal distances Patented Sept. 30, 1930 UNITED STATES PATENT OFFICE FBED H. KROGER, OF BROOKLYN, NEW YORK, ASSIGNOR TO RADIO CORPORATION OF AMERICA, A CORPORATION OF DELAWARE AIR CONDENSER Application filed my a, 1924. Serial No. 710,514.

10 ments in the field.

Another object of my invention is the provision of a condenser plate element having a low cost of manufacture, comparatively large mechanical strength and a minimum 15 brush discharge tendency for a giyen caa pacity-between plates.

Other objects and advantages of my 1nvention will be evident from thefollowing description taken iii-connection with the accompanying drawing, in which:

Fig. 1 is a side elevation of the preferred embodiment of my invention,

Fig. 2 is a plan view, and

Fig. 3 is a cross section viewof one of 35 the condenser plate elements incorporated in my condenser.

Referring to Figs. 1 and 2 my condenser comprises a frame work structure and a plurality of suitably spaced condenser plate elements. The frame work structure comprises a base portion A, an upper portion B and a plurality of spacing members C.

base portion A and the upper portion B each comprises a substantially hexagonal structure consisting of six similar members 1. made of insulating material, joined together near their extremities by means of half-lap joints. Each of these hexagonal structures also has incorporated in it two similar supporting members 2,'made of 1nsulating material, each of the supporting members having the same cross section di' mensions as the members 1. but having greater length than the members 1.

In the upper hexagonal structure, a supporting member 2 is placed on the uppersurface of one of the members 1, so that the widths of the two members coincide throughout their lengths, the sup ortin member 2 lilayond the ends of the member 1. Another supporting member 2 is similarly placed with respect to another member 1 comprising an opposite side of the hexagonal structure with respect to the above-mentioned member.

Two supporting members 2 are similarly placed on the lower surfaces of two of the members 1 forming opposite sides of the lower hexagonal structure. The members 1 and the supporting members 2 are preferably made of hard maple, dried and boiled in linseend oil, the members 1 and 2 being varnished with suitable insulating varnish after assembly.

Six tubular spacing members 3 of electrical conducting material threaded at their extremities with nuts 4 'screwed thereon and washers 5 placed thereon are inserted through suitable holes in the half-lap joints of memhers I and registering holes in the supporting members 2 to thereby space the two similar hexagonal structures aisuitable distance away from each other with the various corresponding" members of the two structures being substantially parallel. The members 1 and supporting members 2 of the two hexagonal structures are firmly secured together by the clamping action between nuts 4 and washers 5 and nuts 4 and washers 5'."

Depending insulators 7 for supporting the frame work structure are secured to the under surfaces of the supporting members 2 of the base A by means of cap screws 8,,

the insulators being placed near the extremities of the support ng members as shown. Referring to Fig. 3, a condenser plate element is shown vertically, for convenient arrangement of the figures of the drawing, though actually they referably are positinned horizontally. X plurality of these elements are employed in my condenser, and each comprises an externally concave part 9 and an externally convex part 10, the two parts being made from similar circular plates of some suitable material, such for example as copper, aluminum or brass.

The convex part 10 comprises a main dished portion as shown, a curved upwardly extending peri heral portion 11 and an outwardly extending circumferential flange 12.

I paratively large mechanical strength owing to their dish shape and comparat1vely high brush discharge voltage values for a given capacity between the plate elements owing to the curvature of the elements near the sup-,

porting flanges and owing to the perpendicular distance between the flanges of adjacent plate elements being greater than-the perpendicular distance between the active dish portions. i

The two parts 9 and 10 may be made by die-stamping, spinning, a combination of die-stamping and spinning, or by other suitable methods. The circumferential lip 15 may be lapped over the flange 12 by spinning, bending, pressing or a combination of these methods, or by other suitable methods. I

Referring toFigs. 1 and 2, the upper plate element D, a plurality of which. comprisesone roup of plates,is secured to three of the tubu ar spacing members 3, attachment being made to every other member by suitable securing means. 1

The securing means comprises a substantially U shaped bolt 16, threaded at its extremities, and a substantially L shaped bracket 17, having one of its legs clamped against the inner surface of a spacingmember 3 by means of the U sha ed bolts 16 and nuts 18, the other leg exten ing toward the center of the frame work structure substantially at right angles to the spacing member 3 as shown. The flange portions of the condenser plate element are secured to the inwardly ex-' tending legs of-the bracket 17 by soldering,

brazing, welding or any other suitable methodsas indicated at 19. 7 .Thelower plate element- D a plurality of which comprises the other group of plates, is secured to the three tubular spacing members 3, to which the upper plate D is not secured, in the same manner as described above.

WhileI have shown and described a pre-v ferred embodiment of my invention I wish it understood that I do not limit myself to that embodiment, but may employ such other modifications as come within the spirit and scope of my invention.

Having describedv my invention, what I claim is:

1. In combination, in a condenser provided with supporting rods, a convex condenser plate having a circumferential radially bent flange, a concave plate having a convex porparallel surface alsoihaving an offset rim for engaging ,said securing rim to secure said surfaces; together to forma single plate, the rim of which is substantially farther s aced from the adjacent plates of the con enser than said surface each rim being provided with a projecting means for securing theplates to the rods.

3; In a condenser, a plurality of supporting. rods, a plurality of condenser plate elements,

the combination in each plate of one part having a circumferential 0 set flange and another part having means for engaging and overlapping said flange throughout its extent to suitably secure said parts together to form a single plate, the rim of which is spaced substantially farther from the adjacent plates than the surfaces of the adjacent condenser, each rim being provided with a pro'ecting means for securing the lates to the re s.

4. In a condenser, a plurality of supporting rods, a plurality of condenser plate elements the combination in each late of one part having a peripheral oflset ange and another part also havmg a peripheral offset flange, a

flange of the first mentioned part, whereby said parts are secured together to form a single plate the rim of which is spaced substantially farther from the rim than the adsection of which is lapped over the peripheral jacent plates of the condenser, each rim being rovided with a projecting means for securmg the plates to the rods.

5. In combination, in a condenser provided with a plurality of supportin rods, an externally concave condenser plate aving a peripheral flange, an externally convex condenser plate having a peripheral flange, one

of said flanges being wider than, and folded over, the other flange thereby joining the plates at all points along their periphery into a rigid construction, and means projecting from the common periphery of both plates for-securing the plates to the rods.

' FRED I-I. .KROGER.

tion near its" perimeter and a radial portion at its perimeter whereby the bent flange and re- 

